3.0: Log entries are encoded in base64 (AWDwR3, section 8.4)

Description: this part of the scenario encourages people to call
the logger, and shows them where they can find the information
logged... in this case, in logs/development.log. In the process, I
discovered that other log entries appear to be base64 encoded.

Inexplicably, the problem appears to be reproducible with Ruby
1.8.7, but not with Ruby 1.9.2.